Q.

The correct order of reactivity of alkyl halides: CH3CH2Cl, CH3CHClCH3 and CH33CCl towards dehydrohalogenation ?

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a

CH33CCl>CH3CHClCH> 3 CH3CH2Cl

b

CH33CCl>CH3CH2Cl>CH3CHClCH3

c

CH3CH2Cl>CH3CHClCH3>CH33CCl

d

CH3CHClCH> 3 CH33CCl>CH3CH2Cl

answer is D.

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Detailed Solution

  • Dehydrohalogenation is an elimination reaction that removes a hydrogen halide from a substrate. The reaction is commonly associated with alkene synthesis, but it has broader applications.

According to the Saytzeff's rule, an alkyl halide which gives more stable alkene (highly substituted) must undergo dehydrohalogenation reaction faster than the alkyl halide which gives less stable (less substituted) alkenes. Hence, the reactivity of the alkyl halides follows the order:- Tertiary>Secondary>Primary.

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